Perhaps you worriers should check out the different cemetery customs around America. You might well be surprised to find out all that happens in cemeteries. Not too many weddings though.
Would I put a cache in Arlington? Yes! How about starting a muti in Robert E. Lee's front yard, where Union forces decided to bury their fallen brothers? Think of all that we could learn about what America really means. Things like; fidelity, honor, bravery, sacrifice, duty and patriotism. Just because we walk around with a GPS in our hands does not mean that we are irreverent.
And the ground is no more hallowed at Arlington than it is in Forest Cemetery in Toledo, Ohio. Two Medal of Honor recipients rest there at their final post. Both are mentioned in Gumption Stumption. Who could stand at their graves and not be in awe?
If you choose to seek The Duke of Tralee you will learn a lot about Hall of Famer Roger Bresnahan. Just around the corner is Medal of Honor recipient John S. Kountz, Musician, Company G, 37th Ohio Infantry who put down his instrument and took up a musket at Missionary Ridge.
For you who, for one reason or another, are worried about caches in cemeteries, stay out. Cache somewhere else. [Kant spel.]